Players will need to be good with a bow to complete this challenge, as they need to kill nine unaware enemies from behind using their bow. Players who are smart and use headshots can pretty easily complete this challenge in one go. They just need to ensure that the enemies have their backs to them before silently taking them out with a This is probably the most straightforward challenge that players have to complete as they just have to kill fifteen enemies with a long-barreled shotgun. Players...